EP 4265752 A1 20231025 - STEEL SHEET AND WELDED JOINT
Title (en)
STEEL SHEET AND WELDED JOINT
Title (de)
STAHLBLECH UND SCHWEISSVERBINDUNG
Title (fr)
TÔLE D'ACIER ET JOINT SOUDÉ
Publication
Application
Priority
- JP 2022006706 W 20220218
- JP 2021051017 A 20210325
Abstract (en)
A steel sheet has a predetermined chemical composition, when a sheet thickness is denoted by t, a metallographic structure at a t/4-position, which is a position t/4 away from a surface, in a cross section in a sheet thickness direction includes, by volume percentage, ferrite: 20% or greater, bainite and martensite: 40% or greater in total, and a remainder consisting of one or more selected from residual austenite and pearlite, when a Mn concentration is measured at a plurality of measurement points at intervals of 1 µm in a square region with a side length of t/4 centered at the t/4-position in the cross section in the sheet thickness direction, a proportion of measurement points at which the Mn concentration is 1.1 times or greater an average of the Mn concentrations at all of the plurality of measurement points is less than 10.0%, the tensile strength is 980 MPa or greater, and the product of the tensile strength and the total elongation is 10,500 MPa·% or greater.
IPC 8 full level
C21D 9/00 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
B23K 11/11 (2013.01 - US); B32B 15/013 (2013.01 - EP); C21D 1/18 (2013.01 - US); C21D 1/185 (2013.01 - EP); C21D 1/84 (2013.01 - US); C21D 6/001 (2013.01 - US); C21D 6/002 (2013.01 - US); C21D 6/004 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/007 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - EP US); C21D 8/021 (2013.01 - EP US); C21D 8/0226 (2013.01 - US); C21D 8/0236 (2013.01 - US); C21D 8/0263 (2013.01 - US); C21D 8/0278 (2013.01 - US); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - US); C22C 38/002 (2013.01 - US); C22C 38/005 (2013.01 - US); C22C 38/008 (2013.01 - US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP US); C22C 38/10 (2013.01 - US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/18 (2013.01 - EP); C22C 38/20 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/30 (2013.01 - US); C22C 38/32 (2013.01 - EP US); C22C 38/34 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/42 (2013.01 - KR); C22C 38/44 (2013.01 - KR US); C22C 38/46 (2013.01 - KR US); C22C 38/48 (2013.01 - KR US); C22C 38/50 (2013.01 - KR US); C22C 38/52 (2013.01 - US); C22C 38/54 (2013.01 - KR US); C22C 38/58 (2013.01 - EP KR US); C22C 38/60 (2013.01 - US); C23C 2/06 (2013.01 - KR); C23C 2/285 (2013.01 - US); C21D 2211/001 (2013.01 - KR US); C21D 2211/002 (2013.01 - EP KR US); C21D 2211/005 (2013.01 - EP KR US); C21D 2211/008 (2013.01 - EP KR US); C21D 2211/009 (2013.01 - KR US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4265752 A1 20231025; EP 4265752 A4 20240522; CN 116917518 A 20231020; JP WO2022202020 A1 20220929; KR 20230128531 A 20230905; MX 2023008914 A 20230810; US 2024141467 A1 20240502; WO 2022202020 A1 20220929
DOCDB simple family (application)
EP 22774820 A 20220218; CN 202280014101 A 20220218; JP 2022006706 W 20220218; JP 2023508799 A 20220218; KR 20237026554 A 20220218; MX 2023008914 A 20220218; US 202218273453 A 20220218